To see a cross section of your model, the Profile Builder tool is used. This allows you to see any clearance violations under different conductor sag conditions. Any clearance lines defined in the clearance menu item are shown in the profile view as a blue line. 

A profile will automatically be created as conductors are placed and selected. However, to create the profile of a specific section, left click the tool and then select clear in the properties tab. You can then left click the poles you would like to be included sequentially and the profile view will automatically update. 

Using the 'Auto-extend' button, once a couple of poles have been clicked the remainder of the line can be extended. With the view reduced at any point using the 'remove after' (to remove a specific section, or the clear (to remove the entire view).